#!/usr/bin/env python

from operator import add,sub
from random import randint,choice

ops = {'+': add,'-':sub}

MAXTRIES = 2

def doprob():
	nums = [randint(1,10) for i in range(2)]
	nums.sort(reverse=True)
	op = choice('+-')
	ans = ops[op](*nums)
	pr = '%d %s %d '% (nums[0],op,nums[1])
	oops = 0
	while True:
		try:
			if int(raw_input(pr)) == ans:
				print 'correct'
				break
			if oops == MAXTRIES:
				print 'answer\n %s %d'%(pr,ans)
			else:
				print 'incorrect... try again'
				oops+=1
		except(KeyboardInterrupt,EOFError,ValueError):
			print 'invalid input ... try again'

def main():
	while True:
		doprob()
		try:
			opt = raw_input('Again?[y]')
			if opt and opt[0] == 'n':
				break
		except(KeyboardInterrupt,EOFError):
			break
if __name__ == '__main__':
	main()
		